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<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># 使用contextmanager，设置上下文</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">DBTools_V2</span>():</span></span><br><span class="line"> <span class="function"><span class="keyword">def</span> <span class="title">__init__</span>(<span class="params">self, host=<span class="string">'192.168.0.188'</span>, port=<span class="number">3306</span>, db=<span class="string">'xx'</span>, user=<span class="string">'xx'</span>, passwd=<span class="string">'xx?'</span>, charset=<span class="string">'utf8'</span></span>):</span></span><br><span class="line"> <span class="comment"># 建立连接</span></span><br><span class="line"> self.conn = pymysql.connect(host=host, port=port, db=db, user=user, passwd=passwd, charset=charset)</span><br><span class="line"> <span class="comment"># 创建游标，操作设置为字典类型</span></span><br><span class="line"> self.cur = self.conn.cursor(cursor=pymysql.cursors.DictCursor)</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">def</span> <span class="title">select_by_parameters</span>(<span class="params">self, sql, params=None</span>):</span></span><br><span class="line"> <span class="keyword">try</span>:</span><br><span class="line"> self.cur.execute(sql, params)</span><br><span class="line"> result = self.cur.fetchall()</span><br><span class="line"> <span class="keyword">return</span> result</span><br><span class="line"> <span class="keyword">except</span> Exception <span class="keyword">as</span> e:</span><br><span class="line"> print(e)</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">def</span> <span class="title">update_by_parameters</span>(<span class="params">self, sql, params=None</span>):</span></span><br><span class="line"> <span class="keyword">try</span>:</span><br><span class="line"> count = self.cur.execute(sql, params)</span><br><span class="line"> <span class="keyword">return</span> count</span><br><span class="line"> <span class="keyword">except</span> Exception <span class="keyword">as</span> e:</span><br><span class="line"> print(e)</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="meta">@contextmanager</span></span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">create_mysql_connect</span>(<span class="params">host=<span class="string">'192.168.0.188'</span>, port=<span class="number">3306</span>, db=<span class="string">'xx'</span>, user=<span class="string">'xx'</span>, passwd=<span class="string">'xx?'</span>, charset=<span class="string">'utf8'</span></span>):</span></span><br><span class="line"> <span class="comment"># with 执行部分</span></span><br><span class="line"> print(<span class="string">"开始执行"</span>)</span><br><span class="line"> db = DBTools_V2(host=host, port=port, db=db, user=user, passwd=passwd, charset=charset)</span><br><span class="line"> <span class="comment"># as 赋值</span></span><br><span class="line"> <span class="keyword">yield</span> db</span><br><span class="line"> <span class="comment"># 执行完代码后的处理</span></span><br><span class="line"> db.conn.commit()</span><br><span class="line"> db.cur.close()</span><br><span class="line"> db.conn.close()</span><br></pre></td></tr></table></figure>
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